How to use the cascader role option

Does anyone have used the cascader-role opt-in feature for a Goal Plan Template? I trying to follow the instructions described in the Implementation Guide for Goal Management (Unit 6.5 page 105, in Q4 2017 version) it says: When the "cascader-role” is enabled, the “cascader” role controls what field can be seen and edited and what table actions are permitted for the user who is cascading their goal. But I'm not sure how to configure this.